Table 3 Risk of dying on days with a mean apparent temperature of 30°C (lag 0–1) versus days with a temperature of 20°C among people age 65+ years who died in hospital and were already in hospital two days before death: effect modification by age and hospital ward

Ward of the hospital	%	Age 65–74 years			Age 75–84 years			Age 85+years
Ward of the hospital	%	No	OR (95% CI)	REM index† (p.value)	No	OR (95% CI)	REM index† (p value)	No	OR (95% CI)	REM index† (p value)
General medicine	56	11960	1.31 (1.14 to 1.50)	1.00 (–)	21334	1.39 (1.25 to 1.54)	1.00 (–)	20187	1.46 (1.27 to 1.68)	1.00 (–)
Low-care	26	8295	1.25 (0.91 to 1.70)	0.95 (0.781)	9892	1.17 (1.00 to 1.38)	0.85 (0.089)	6112	1.62 (1.32 to 1.99)	1.11 (0.397)
High-care	6	2031	1.12 (0.78 to 1.60)	0.85 (0.419)	2472	0.98 (0.71 to 1.35)	0.71 (0.046)	1288	1.31 (0.86 to 2.00)	0.90 (0.644)
Intensive care	11	4149	1.07 (0.83 to 1.38)	0.82 (0.181)	4919	0.92 (0.73 to 1.16)	0.67 (0.002)	1505	1.82 (1.20 to 2.77)	1.25 (0.323)

*Odds ratio (OR) and 95% confidence intervals (CI). Results in italics are from random effects models.
†REM, relative effect modification index is calculated as the ratio between the specific OR and the OR from the reference category (from the age-adjusted model).